Lately I've been having dreams that take place in a particular setting, where events unfold in direction 'x'. Yet after a while I find myself back at the beginning of the dream, only to experience a new storyline.

Does this signify anything?

Quoting: CatCarel

There are endless story-lines. Perhaps you are just experiencing what different possibilities would be like.

(More accurately, experiencing more of the values inherent in the current perspective.)